Manafort's court filing may have answered that question.
The key question here is, did the campaign amplify its efforts with the help of foreign operatives? 3/
You need data for that. The kind of data that Manafort allegedly shared. 4/
1) As campaign chairman, Paul Manafort met with and shared sensitive polling data with Russian operative Konstantin Kilimnik.
2) Manafort & Kilimnik then discussed a "Ukrainian peace plan."
3) Manafort then lied about it.